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Linux ulimit command

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Linux ulimit shell command control program resources.

ulimit shell built-in commands to be used to control resource shell program execution.

grammar 

ulimit [-aHS][-c <core文件上限>][-d <数据节区大小>][-f <文件大小>][-m <内存大小>][-n <文件数目>][-p <缓冲区大小>][-s <堆叠大小>][-t <CPU时间>][-u <程序数目>][-v <虚拟内存大小>]

Parameters:

  • -a Displays the current resource limit settings.
  • -c <core file limit> Set the maximum core file, in units of blocks.
  • -d <data section area size> maximum program data section area, in units of KB.
  • Maximum file -f <size> shell can be established, in units of blocks.
  • -H Setting a hard limit of resources, which is the limit set by the administrator.
  • -m <memory size> can be used to specify the upper limit of the memory unit is KB.
  • The number of files -n <number of files> Specifies the same time open up.
  • -p <buffer size> Specify the size of the pipe buffer, 512 units of bytes.
  • -s <stack-size> specifies the upper limit of the stack, in units of KB.
  • -S Setting the elastic limit of resources.
  • -t <CPU time> specify the maximum time of CPU, in seconds.
  • -u <program number> The number of procedures that open up to the user.
  • -v <virtual memory size> Specifies the maximum virtual memory that can be used, in units of KB.

Examples

Setting Display System Resources 

[[email protected] ~]# ulimit -a
core file size     (blocks, -c) 0
data seg size      (kbytes, -d) unlimited
file size        (blocks, -f) unlimited
pending signals         (-i) 1024
max locked memory    (kbytes, -l) 32
max memory size     (kbytes, -m) unlimited
open files           (-n) 1024
pipe size      (512 bytes, -p) 8
POSIX message queues   (bytes, -q) 819200
stack size       (kbytes, -s) 10240
cpu time        (seconds, -t) unlimited
max user processes       (-u) 4096
virtual memory     (kbytes, -v) unlimited
file locks           (-x) unlimited
[[email protected] ~]#

Set the maximum number of single-user program 

[[email protected] ~]# ulimit -u 500 //设置单一用户程序上限
[[email protected] ~]# ulimit -a
core file size     (blocks, -c) 0
data seg size      (kbytes, -d) unlimited
file size        (blocks, -f) unlimited
pending signals         (-i) 1024
max locked memory    (kbytes, -l) 32
max memory size     (kbytes, -m) unlimited
open files           (-n) 1024
pipe size      (512 bytes, -p) 8
POSIX message queues   (bytes, -q) 819200
stack size       (kbytes, -s) 10240
cpu time        (seconds, -t) unlimited
max user processes       (-u) 500
virtual memory     (kbytes, -v) unlimited
file locks           (-x) unlimited
[[email protected] ~]#

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